//     Underscore.js 1.8.3
//     http://underscorejs.org
//     (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
//     Underscore may be freely distributed under the MIT license.

(function() {

  // Baseline setup
  // --------------

  // Establish the root object, `window` in the browser, or `exports` on the server.
  //var root = this;

  // Save the previous value of the `_` variable.
  //var previousUnderscore = root._;

  // Save bytes in the minified (but not gzipped) version:
  var ArrayProto = Array.prototype,
      ObjProto = Object.prototype,
      FuncProto = Function.prototype;

  // Create quick reference variables for speed access to core prototypes.
  var
      push = ArrayProto.push,
      slice = ArrayProto.slice,
      toString = ObjProto.toString,
      hasOwnProperty = ObjProto.hasOwnProperty;

  // All **ECMAScript 5** native function implementations that we hope to use
  // are declared here.
  var
      nativeIsArray = Array.isArray,
      nativeKeys = Object.keys,
      nativeBind = FuncProto.bind,
      nativeCreate = Object.create;

  // Naked function reference for surrogate-prototype-swapping.
  var Ctor = function() {};

  // Create a safe reference to the Underscore object for use below.
  var _ = function(obj) {
      if (obj instanceof _) return obj;
      if (!(this instanceof _)) return new _(obj);
      this._wrapped = obj;
  };

  // Export the Underscore object for **Node.js**, with
  // backwards-compatibility for the old `require()` API. If we're in
  // the browser, add `_` as a global object.
  if (typeof exports !== 'undefined') {
      if (typeof module !== 'undefined' && module.exports) {
          exports = module.exports = _;
      }
      exports._ = _;
  } else {
      root._ = _;
  }

  // Current version.
  _.VERSION = '1.8.3';

  // Internal function that returns an efficient (for current engines) version
  // of the passed-in callback, to be repeatedly applied in other Underscore
  // functions.
  var optimizeCb = function(func, context, argCount) {
      if (context === void 0) return func;
      switch (argCount == null ? 3 : argCount) {
          case 1:
              return function(value) {
                  return func.call(context, value);
              };
          case 2:
              return function(value, other) {
                  return func.call(context, value, other);
              };
          case 3:
              return function(value, index, collection) {
                  return func.call(context, value, index, collection);
              };
          case 4:
              return function(accumulator, value, index, collection) {
                  return func.call(context, accumulator, value, index, collection);
              };
      }
      return function() {
          return func.apply(context, arguments);
      };
  };

  // A mostly-internal function to generate callbacks that can be applied
  // to each element in a collection, returning the desired result — either
  // identity, an arbitrary callback, a property matcher, or a property accessor.
  var cb = function(value, context, argCount) {
      if (value == null) return _.identity;
      if (_.isFunction(value)) return optimizeCb(value, context, argCount);
      if (_.isObject(value)) return _.matcher(value);
      return _.property(value);
  };
  _.iteratee = function(value, context) {
      return cb(value, context, Infinity);
  };

  // An internal function for creating assigner functions.
  var createAssigner = function(keysFunc, undefinedOnly) {
      return function(obj) {
          var length = arguments.length;
          if (length < 2 || obj == null) return obj;
          for (var index = 1; index < length; index++) {
              var source = arguments[index],
                  keys = keysFunc(source),
                  l = keys.length;
              for (var i = 0; i < l; i++) {
                  var key = keys[i];
                  if (!undefinedOnly || obj[key] === void 0) obj[key] = source[key];
              }
          }
          return obj;
      };
  };

  // An internal function for creating a new object that inherits from another.
  var baseCreate = function(prototype) {
      if (!_.isObject(prototype)) return {};
      if (nativeCreate) return nativeCreate(prototype);
      Ctor.prototype = prototype;
      var result = new Ctor;
      Ctor.prototype = null;
      return result;
  };

  var property = function(key) {
      return function(obj) {
          return obj == null ? void 0 : obj[key];
      };
  };

  // Helper for collection methods to determine whether a collection
  // should be iterated as an array or as an object
  // Related: http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
  // Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094
  var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1;
  var getLength = property('length');
  var isArrayLike = function(collection) {
      var length = getLength(collection);
      return typeof length == 'number' && length >= 0 && length <= MAX_ARRAY_INDEX;
  };

  // Collection Functions
  // --------------------

  // The cornerstone, an `each` implementation, aka `forEach`.
  // Handles raw objects in addition to array-likes. Treats all
  // sparse array-likes as if they were dense.
  _.each = _.forEach = function(obj, iteratee, context) {
      iteratee = optimizeCb(iteratee, context);
      var i, length;
      if (isArrayLike(obj)) {
          for (i = 0, length = obj.length; i < length; i++) {
              iteratee(obj[i], i, obj);
          }
      } else {
          var keys = _.keys(obj);
          for (i = 0, length = keys.length; i < length; i++) {
              iteratee(obj[keys[i]], keys[i], obj);
          }
      }
      return obj;
  };

  // Return the results of applying the iteratee to each element.
  _.map = _.collect = function(obj, iteratee, context) {
      iteratee = cb(iteratee, context);
      var keys = !isArrayLike(obj) && _.keys(obj),
          length = (keys || obj).length,
          results = Array(length);
      for (var index = 0; index < length; index++) {
          var currentKey = keys ? keys[index] : index;
          results[index] = iteratee(obj[currentKey], currentKey, obj);
      }
      return results;
  };

  // Create a reducing function iterating left or right.
  function createReduce(dir) {
      // Optimized iterator function as using arguments.length
      // in the main function will deoptimize the, see #1991.
      function iterator(obj, iteratee, memo, keys, index, length) {
          for (; index >= 0 && index < length; index += dir) {
              var currentKey = keys ? keys[index] : index;
              memo = iteratee(memo, obj[currentKey], currentKey, obj);
          }
          return memo;
      }

      return function(obj, iteratee, memo, context) {
          iteratee = optimizeCb(iteratee, context, 4);
          var keys = !isArrayLike(obj) && _.keys(obj),
              length = (keys || obj).length,
              index = dir > 0 ? 0 : length - 1;
          // Determine the initial value if none is provided.
          if (arguments.length < 3) {
              memo = obj[keys ? keys[index] : index];
              index += dir;
          }
          return iterator(obj, iteratee, memo, keys, index, length);
      };
  }

  // **Reduce** builds up a single result from a list of values, aka `inject`,
  // or `foldl`.
  _.reduce = _.foldl = _.inject = createReduce(1);

  // The right-associative version of reduce, also known as `foldr`.
  _.reduceRight = _.foldr = createReduce(-1);

  // Return the first value which passes a truth test. Aliased as `detect`.
  _.find = _.detect = function(obj, predicate, context) {
      var key;
      if (isArrayLike(obj)) {
          key = _.findIndex(obj, predicate, context);
      } else {
          key = _.findKey(obj, predicate, context);
      }
      if (key !== void 0 && key !== -1) return obj[key];
  };

  // Return all the elements that pass a truth test.
  // Aliased as `select`.
  _.filter = _.select = function(obj, predicate, context) {
      var results = [];
      predicate = cb(predicate, context);
      _.each(obj, function(value, index, list) {
          if (predicate(value, index, list)) results.push(value);
      });
      return results;
  };

  // Return all the elements for which a truth test fails.
  _.reject = function(obj, predicate, context) {
      return _.filter(obj, _.negate(cb(predicate)), context);
  };

  // Determine whether all of the elements match a truth test.
  // Aliased as `all`.
  _.every = _.all = function(obj, predicate, context) {
      predicate = cb(predicate, context);
      var keys = !isArrayLike(obj) && _.keys(obj),
          length = (keys || obj).length;
      for (var index = 0; index < length; index++) {
          var currentKey = keys ? keys[index] : index;
          if (!predicate(obj[currentKey], currentKey, obj)) return false;
      }
      return true;
  };

  // Determine if at least one element in the object matches a truth test.
  // Aliased as `any`.
  _.some = _.any = function(obj, predicate, context) {
      predicate = cb(predicate, context);
      var keys = !isArrayLike(obj) && _.keys(obj),
          length = (keys || obj).length;
      for (var index = 0; index < length; index++) {
          var currentKey = keys ? keys[index] : index;
          if (predicate(obj[currentKey], currentKey, obj)) return true;
      }
      return false;
  };

  // Determine if the array or object contains a given item (using `===`).
  // Aliased as `includes` and `include`.
  _.contains = _.includes = _.include = function(obj, item, fromIndex, guard) {
      if (!isArrayLike(obj)) obj = _.values(obj);
      if (typeof fromIndex != 'number' || guard) fromIndex = 0;
      return _.indexOf(obj, item, fromIndex) >= 0;
  };

  // Invoke a method (with arguments) on every item in a collection.
  _.invoke = function(obj, method) {
      var args = slice.call(arguments, 2);
      var isFunc = _.isFunction(method);
      return _.map(obj, function(value) {
          var func = isFunc ? method : value[method];
          return func == null ? func : func.apply(value, args);
      });
  };

  // Convenience version of a common use case of `map`: fetching a property.
  _.pluck = function(obj, key) {
      return _.map(obj, _.property(key));
  };

  // Convenience version of a common use case of `filter`: selecting only objects
  // containing specific `key:value` pairs.
  _.where = function(obj, attrs) {
      return _.filter(obj, _.matcher(attrs));
  };

  // Convenience version of a common use case of `find`: getting the first object
  // containing specific `key:value` pairs.
  _.findWhere = function(obj, attrs) {
      return _.find(obj, _.matcher(attrs));
  };

  // Return the maximum element (or element-based computation).
  _.max = function(obj, iteratee, context) {
      var result = -Infinity,
          lastComputed = -Infinity,
          value, computed;
      if (iteratee == null && obj != null) {
          obj = isArrayLike(obj) ? obj : _.values(obj);
          for (var i = 0, length = obj.length; i < length; i++) {
              value = obj[i];
              if (value > result) {
                  result = value;
              }
          }
      } else {
          iteratee = cb(iteratee, context);
          _.each(obj, function(value, index, list) {
              computed = iteratee(value, index, list);
              if (computed > lastComputed || computed === -Infinity && result === -Infinity) {
                  result = value;
                  lastComputed = computed;
              }
          });
      }
      return result;
  };

  // Return the minimum element (or element-based computation).
  _.min = function(obj, iteratee, context) {
      var result = Infinity,
          lastComputed = Infinity,
          value, computed;
      if (iteratee == null && obj != null) {
          obj = isArrayLike(obj) ? obj : _.values(obj);
          for (var i = 0, length = obj.length; i < length; i++) {
              value = obj[i];
              if (value < result) {
                  result = value;
              }
          }
      } else {
          iteratee = cb(iteratee, context);
          _.each(obj, function(value, index, list) {
              computed = iteratee(value, index, list);
              if (computed < lastComputed || computed === Infinity && result === Infinity) {
                  result = value;
                  lastComputed = computed;
              }
          });
      }
      return result;
  };

  // Shuffle a collection, using the modern version of the
  // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
  _.shuffle = function(obj) {
      var set = isArrayLike(obj) ? obj : _.values(obj);
      var length = set.length;
      var shuffled = Array(length);
      for (var index = 0, rand; index < length; index++) {
          rand = _.random(0, index);
          if (rand !== index) shuffled[index] = shuffled[rand];
          shuffled[rand] = set[index];
      }
      return shuffled;
  };

  // Sample **n** random values from a collection.
  // If **n** is not specified, returns a single random element.
  // The internal `guard` argument allows it to work with `map`.
  _.sample = function(obj, n, guard) {
      if (n == null || guard) {
          if (!isArrayLike(obj)) obj = _.values(obj);
          return obj[_.random(obj.length - 1)];
      }
      return _.shuffle(obj).slice(0, Math.max(0, n));
  };

  // Sort the object's values by a criterion produced by an iteratee.
  _.sortBy = function(obj, iteratee, context) {
      iteratee = cb(iteratee, context);
      return _.pluck(_.map(obj, function(value, index, list) {
          return {
              value: value,
              index: index,
              criteria: iteratee(value, index, list)
          };
      }).sort(function(left, right) {
          var a = left.criteria;
          var b = right.criteria;
          if (a !== b) {
              if (a > b || a === void 0) return 1;
              if (a < b || b === void 0) return -1;
          }
          return left.index - right.index;
      }), 'value');
  };

  // An internal function used for aggregate "group by" operations.
  var group = function(behavior) {
      return function(obj, iteratee, context) {
          var result = {};
          iteratee = cb(iteratee, context);
          _.each(obj, function(value, index) {
              var key = iteratee(value, index, obj);
              behavior(result, value, key);
          });
          return result;
      };
  };

  // Groups the object's values by a criterion. Pass either a string attribute
  // to group by, or a function that returns the criterion.
  _.groupBy = group(function(result, value, key) {
      if (_.has(result, key)) result[key].push(value);
      else result[key] = [value];
  });

  // Indexes the object's values by a criterion, similar to `groupBy`, but for
  // when you know that your index values will be unique.
  _.indexBy = group(function(result, value, key) {
      result[key] = value;
  });

  // Counts instances of an object that group by a certain criterion. Pass
  // either a string attribute to count by, or a function that returns the
  // criterion.
  _.countBy = group(function(result, value, key) {
      if (_.has(result, key)) result[key]++;
      else result[key] = 1;
  });

  // Safely create a real, live array from anything iterable.
  _.toArray = function(obj) {
      if (!obj) return [];
      if (_.isArray(obj)) return slice.call(obj);
      if (isArrayLike(obj)) return _.map(obj, _.identity);
      return _.values(obj);
  };

  // Return the number of elements in an object.
  _.size = function(obj) {
      if (obj == null) return 0;
      return isArrayLike(obj) ? obj.length : _.keys(obj).length;
  };

  // Split a collection into two arrays: one whose elements all satisfy the given
  // predicate, and one whose elements all do not satisfy the predicate.
  _.partition = function(obj, predicate, context) {
      predicate = cb(predicate, context);
      var pass = [],
          fail = [];
      _.each(obj, function(value, key, obj) {
          (predicate(value, key, obj) ? pass : fail).push(value);
      });
      return [pass, fail];
  };

  // Array Functions
  // ---------------

  // Get the first element of an array. Passing **n** will return the first N
  // values in the array. Aliased as `head` and `take`. The **guard** check
  // allows it to work with `_.map`.
  _.first = _.head = _.take = function(array, n, guard) {
      if (array == null) return void 0;
      if (n == null || guard) return array[0];
      return _.initial(array, array.length - n);
  };

  // Returns everything but the last entry of the array. Especially useful on
  // the arguments object. Passing **n** will return all the values in
  // the array, excluding the last N.
  _.initial = function(array, n, guard) {
      return slice.call(array, 0, Math.max(0, array.length - (n == null || guard ? 1 : n)));
  };

  // Get the last element of an array. Passing **n** will return the last N
  // values in the array.
  _.last = function(array, n, guard) {
      if (array == null) return void 0;
      if (n == null || guard) return array[array.length - 1];
      return _.rest(array, Math.max(0, array.length - n));
  };

  // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.
  // Especially useful on the arguments object. Passing an **n** will return
  // the rest N values in the array.
  _.rest = _.tail = _.drop = function(array, n, guard) {
      return slice.call(array, n == null || guard ? 1 : n);
  };

  // Trim out all falsy values from an array.
  _.compact = function(array) {
      return _.filter(array, _.identity);
  };

  // Internal implementation of a recursive `flatten` function.
  var flatten = function(input, shallow, strict, startIndex) {
      var output = [],
          idx = 0;
      for (var i = startIndex || 0, length = getLength(input); i < length; i++) {
          var value = input[i];
          if (isArrayLike(value) && (_.isArray(value) || _.isArguments(value))) {
              //flatten current level of array or arguments object
              if (!shallow) value = flatten(value, shallow, strict);
              var j = 0,
                  len = value.length;
              output.length += len;
              while (j < len) {
                  output[idx++] = value[j++];
              }
          } else if (!strict) {
              output[idx++] = value;
          }
      }
      return output;
  };

  // Flatten out an array, either recursively (by default), or just one level.
  _.flatten = function(array, shallow) {
      return flatten(array, shallow, false);
  };

  // Return a version of the array that does not contain the specified value(s).
  _.without = function(array) {
      return _.difference(array, slice.call(arguments, 1));
  };

  // Produce a duplicate-free version of the array. If the array has already
  // been sorted, you have the option of using a faster algorithm.
  // Aliased as `unique`.
  _.uniq = _.unique = function(array, isSorted, iteratee, context) {
      if (!_.isBoolean(isSorted)) {
          context = iteratee;
          iteratee = isSorted;
          isSorted = false;
      }
      if (iteratee != null) iteratee = cb(iteratee, context);
      var result = [];
      var seen = [];
      for (var i = 0, length = getLength(array); i < length; i++) {
          var value = array[i],
              computed = iteratee ? iteratee(value, i, array) : value;
          if (isSorted) {
              if (!i || seen !== computed) result.push(value);
              seen = computed;
          } else if (iteratee) {
              if (!_.contains(seen, computed)) {
                  seen.push(computed);
                  result.push(value);
              }
          } else if (!_.contains(result, value)) {
              result.push(value);
          }
      }
      return result;
  };

  // Produce an array that contains the union: each distinct element from all of
  // the passed-in arrays.
  _.union = function() {
      return _.uniq(flatten(arguments, true, true));
  };

  // Produce an array that contains every item shared between all the
  // passed-in arrays.
  _.intersection = function(array) {
      var result = [];
      var argsLength = arguments.length;
      for (var i = 0, length = getLength(array); i < length; i++) {
          var item = array[i];
          if (_.contains(result, item)) continue;
          for (var j = 1; j < argsLength; j++) {
              if (!_.contains(arguments[j], item)) break;
          }
          if (j === argsLength) result.push(item);
      }
      return result;
  };

  // Take the difference between one array and a number of other arrays.
  // Only the elements present in just the first array will remain.
  _.difference = function(array) {
      var rest = flatten(arguments, true, true, 1);
      return _.filter(array, function(value) {
          return !_.contains(rest, value);
      });
  };

  // Zip together multiple lists into a single array -- elements that share
  // an index go together.
  _.zip = function() {
      return _.unzip(arguments);
  };

  // Complement of _.zip. Unzip accepts an array of arrays and groups
  // each array's elements on shared indices
  _.unzip = function(array) {
      var length = array && _.max(array, getLength).length || 0;
      var result = Array(length);

      for (var index = 0; index < length; index++) {
          result[index] = _.pluck(array, index);
      }
      return result;
  };

  // Converts lists into objects. Pass either a single array of `[key, value]`
  // pairs, or two parallel arrays of the same length -- one of keys, and one of
  // the corresponding values.
  _.object = function(list, values) {
      var result = {};
      for (var i = 0, length = getLength(list); i < length; i++) {
          if (values) {
              result[list[i]] = values[i];
          } else {
              result[list[i][0]] = list[i][1];
          }
      }
      return result;
  };

  // Generator function to create the findIndex and findLastIndex functions
  function createPredicateIndexFinder(dir) {
      return function(array, predicate, context) {
          predicate = cb(predicate, context);
          var length = getLength(array);
          var index = dir > 0 ? 0 : length - 1;
          for (; index >= 0 && index < length; index += dir) {
              if (predicate(array[index], index, array)) return index;
          }
          return -1;
      };
  }

  // Returns the first index on an array-like that passes a predicate test
  _.findIndex = createPredicateIndexFinder(1);
  _.findLastIndex = createPredicateIndexFinder(-1);

  // Use a comparator function to figure out the smallest index at which
  // an object should be inserted so as to maintain order. Uses binary search.
  _.sortedIndex = function(array, obj, iteratee, context) {
      iteratee = cb(iteratee, context, 1);
      var value = iteratee(obj);
      var low = 0,
          high = getLength(array);
      while (low < high) {
          var mid = Math.floor((low + high) / 2);
          if (iteratee(array[mid]) < value) low = mid + 1;
          else high = mid;
      }
      return low;
  };

  // Generator function to create the indexOf and lastIndexOf functions
  function createIndexFinder(dir, predicateFind, sortedIndex) {
      return function(array, item, idx) {
          var i = 0,
              length = getLength(array);
          if (typeof idx == 'number') {
              if (dir > 0) {
                  i = idx >= 0 ? idx : Math.max(idx + length, i);
              } else {
                  length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
              }
          } else if (sortedIndex && idx && length) {
              idx = sortedIndex(array, item);
              return array[idx] === item ? idx : -1;
          }
          if (item !== item) {
              idx = predicateFind(slice.call(array, i, length), _.isNaN);
              return idx >= 0 ? idx + i : -1;
          }
          for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
              if (array[idx] === item) return idx;
          }
          return -1;
      };
  }

  // Return the position of the first occurrence of an item in an array,
  // or -1 if the item is not included in the array.
  // If the array is large and already in sort order, pass `true`
  // for **isSorted** to use binary search.
  _.indexOf = createIndexFinder(1, _.findIndex, _.sortedIndex);
  _.lastIndexOf = createIndexFinder(-1, _.findLastIndex);

  // Generate an integer Array containing an arithmetic progression. A port of
  // the native Python `range()` function. See
  // [the Python documentation](http://docs.python.org/library/functions.html#range).
  _.range = function(start, stop, step) {
      if (stop == null) {
          stop = start || 0;
          start = 0;
      }
      step = step || 1;

      var length = Math.max(Math.ceil((stop - start) / step), 0);
      var range = Array(length);

      for (var idx = 0; idx < length; idx++, start += step) {
          range[idx] = start;
      }

      return range;
  };

  // Function (ahem) Functions
  // ------------------

  // Determines whether to execute a function as a constructor
  // or a normal function with the provided arguments
  var executeBound = function(sourceFunc, boundFunc, context, callingContext, args) {
      if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);
      var self = baseCreate(sourceFunc.prototype);
      var result = sourceFunc.apply(self, args);
      if (_.isObject(result)) return result;
      return self;
  };

  // Create a function bound to a given object (assigning `this`, and arguments,
  // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if
  // available.
  _.bind = function(func, context) {
      if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
      if (!_.isFunction(func)) throw new TypeError('Bind must be called on a function');
      var args = slice.call(arguments, 2);
      var bound = function() {
          return executeBound(func, bound, context, this, args.concat(slice.call(arguments)));
      };
      return bound;
  };

  // Partially apply a function by creating a version that has had some of its
  // arguments pre-filled, without changing its dynamic `this` context. _ acts
  // as a placeholder, allowing any combination of arguments to be pre-filled.
  _.partial = function(func) {
      var boundArgs = slice.call(arguments, 1);
      var bound = function() {
          var position = 0,
              length = boundArgs.length;
          var args = Array(length);
          for (var i = 0; i < length; i++) {
              args[i] = boundArgs[i] === _ ? arguments[position++] : boundArgs[i];
          }
          while (position < arguments.length) args.push(arguments[position++]);
          return executeBound(func, bound, this, this, args);
      };
      return bound;
  };

  // Bind a number of an object's methods to that object. Remaining arguments
  // are the method names to be bound. Useful for ensuring that all callbacks
  // defined on an object belong to it.
  _.bindAll = function(obj) {
      var i, length = arguments.length,
          key;
      if (length <= 1) throw new Error('bindAll must be passed function names');
      for (i = 1; i < length; i++) {
          key = arguments[i];
          obj[key] = _.bind(obj[key], obj);
      }
      return obj;
  };

  // Memoize an expensive function by storing its results.
  _.memoize = function(func, hasher) {
      var memoize = function(key) {
          var cache = memoize.cache;
          var address = '' + (hasher ? hasher.apply(this, arguments) : key);
          if (!_.has(cache, address)) cache[address] = func.apply(this, arguments);
          return cache[address];
      };
      memoize.cache = {};
      return memoize;
  };

  // Delays a function for the given number of milliseconds, and then calls
  // it with the arguments supplied.
  _.delay = function(func, wait) {
      var args = slice.call(arguments, 2);
      return setTimeout(function() {
          return func.apply(null, args);
      }, wait);
  };

  // Defers a function, scheduling it to run after the current call stack has
  // cleared.
  _.defer = _.partial(_.delay, _, 1);

  // Returns a function, that, when invoked, will only be triggered at most once
  // during a given window of time. Normally, the throttled function will run
  // as much as it can, without ever going more than once per `wait` duration;
  // but if you'd like to disable the execution on the leading edge, pass
  // `{leading: false}`. To disable execution on the trailing edge, ditto.
  _.throttle = function(func, wait, options) {
      var context, args, result;
      var timeout = null;
      var previous = 0;
      if (!options) options = {};
      var later = function() {
          previous = options.leading === false ? 0 : _.now();
          timeout = null;
          result = func.apply(context, args);
          if (!timeout) context = args = null;
      };
      return function() {
          var now = _.now();
          if (!previous && options.leading === false) previous = now;
          var remaining = wait - (now - previous);
          context = this;
          args = arguments;
          if (remaining <= 0 || remaining > wait) {
              if (timeout) {
                  clearTimeout(timeout);
                  timeout = null;
              }
              previous = now;
              result = func.apply(context, args);
              if (!timeout) context = args = null;
          } else if (!timeout && options.trailing !== false) {
              timeout = setTimeout(later, remaining);
          }
          return result;
      };
  };

  // Returns a function, that, as long as it continues to be invoked, will not
  // be triggered. The function will be called after it stops being called for
  // N milliseconds. If `immediate` is passed, trigger the function on the
  // leading edge, instead of the trailing.
  _.debounce = function(func, wait, immediate) {
      var timeout, args, context, timestamp, result;

      var later = function() {
          var last = _.now() - timestamp;

          if (last < wait && last >= 0) {
              timeout = setTimeout(later, wait - last);
          } else {
              timeout = null;
              if (!immediate) {
                  result = func.apply(context, args);
                  if (!timeout) context = args = null;
              }
          }
      };

      return function() {
          context = this;
          args = arguments;
          timestamp = _.now();
          var callNow = immediate && !timeout;
          if (!timeout) timeout = setTimeout(later, wait);
          if (callNow) {
              result = func.apply(context, args);
              context = args = null;
          }

          return result;
      };
  };

  // Returns the first function passed as an argument to the second,
  // allowing you to adjust arguments, run code before and after, and
  // conditionally execute the original function.
  _.wrap = function(func, wrapper) {
      return _.partial(wrapper, func);
  };

  // Returns a negated version of the passed-in predicate.
  _.negate = function(predicate) {
      return function() {
          return !predicate.apply(this, arguments);
      };
  };

  // Returns a function that is the composition of a list of functions, each
  // consuming the return value of the function that follows.
  _.compose = function() {
      var args = arguments;
      var start = args.length - 1;
      return function() {
          var i = start;
          var result = args[start].apply(this, arguments);
          while (i--) result = args[i].call(this, result);
          return result;
      };
  };

  // Returns a function that will only be executed on and after the Nth call.
  _.after = function(times, func) {
      return function() {
          if (--times < 1) {
              return func.apply(this, arguments);
          }
      };
  };

  // Returns a function that will only be executed up to (but not including) the Nth call.
  _.before = function(times, func) {
      var memo;
      return function() {
          if (--times > 0) {
              memo = func.apply(this, arguments);
          }
          if (times <= 1) func = null;
          return memo;
      };
  };

  // Returns a function that will be executed at most one time, no matter how
  // often you call it. Useful for lazy initialization.
  _.once = _.partial(_.before, 2);

  // Object Functions
  // ----------------

  // Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.
  var hasEnumBug = !{ toString: null }.propertyIsEnumerable('toString');
  var nonEnumerableProps = ['valueOf', 'isPrototypeOf', 'toString',
      'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'
  ];

  function collectNonEnumProps(obj, keys) {
      var nonEnumIdx = nonEnumerableProps.length;
      var constructor = obj.constructor;
      var proto = (_.isFunction(constructor) && constructor.prototype) || ObjProto;

      // Constructor is a special case.
      var prop = 'constructor';
      if (_.has(obj, prop) && !_.contains(keys, prop)) keys.push(prop);

      while (nonEnumIdx--) {
          prop = nonEnumerableProps[nonEnumIdx];
          if (prop in obj && obj[prop] !== proto[prop] && !_.contains(keys, prop)) {
              keys.push(prop);
          }
      }
  }

  // Retrieve the names of an object's own properties.
  // Delegates to **ECMAScript 5**'s native `Object.keys`
  _.keys = function(obj) {
      if (!_.isObject(obj)) return [];
      if (nativeKeys) return nativeKeys(obj);
      var keys = [];
      for (var key in obj)
          if (_.has(obj, key)) keys.push(key);
          // Ahem, IE < 9.
      if (hasEnumBug) collectNonEnumProps(obj, keys);
      return keys;
  };

  // Retrieve all the property names of an object.
  _.allKeys = function(obj) {
      if (!_.isObject(obj)) return [];
      var keys = [];
      for (var key in obj) keys.push(key);
      // Ahem, IE < 9.
      if (hasEnumBug) collectNonEnumProps(obj, keys);
      return keys;
  };

  // Retrieve the values of an object's properties.
  _.values = function(obj) {
      var keys = _.keys(obj);
      var length = keys.length;
      var values = Array(length);
      for (var i = 0; i < length; i++) {
          values[i] = obj[keys[i]];
      }
      return values;
  };

  // Returns the results of applying the iteratee to each element of the object
  // In contrast to _.map it returns an object
  _.mapObject = function(obj, iteratee, context) {
      iteratee = cb(iteratee, context);
      var keys = _.keys(obj),
          length = keys.length,
          results = {},
          currentKey;
      for (var index = 0; index < length; index++) {
          currentKey = keys[index];
          results[currentKey] = iteratee(obj[currentKey], currentKey, obj);
      }
      return results;
  };

  // Convert an object into a list of `[key, value]` pairs.
  _.pairs = function(obj) {
      var keys = _.keys(obj);
      var length = keys.length;
      var pairs = Array(length);
      for (var i = 0; i < length; i++) {
          pairs[i] = [keys[i], obj[keys[i]]];
      }
      return pairs;
  };

  // Invert the keys and values of an object. The values must be serializable.
  _.invert = function(obj) {
      var result = {};
      var keys = _.keys(obj);
      for (var i = 0, length = keys.length; i < length; i++) {
          result[obj[keys[i]]] = keys[i];
      }
      return result;
  };

  // Return a sorted list of the function names available on the object.
  // Aliased as `methods`
  _.functions = _.methods = function(obj) {
      var names = [];
      for (var key in obj) {
          if (_.isFunction(obj[key])) names.push(key);
      }
      return names.sort();
  };

  // Extend a given object with all the properties in passed-in object(s).
  _.extend = createAssigner(_.allKeys);

  // Assigns a given object with all the own properties in the passed-in object(s)
  // (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
  _.extendOwn = _.assign = createAssigner(_.keys);

  // Returns the first key on an object that passes a predicate test
  _.findKey = function(obj, predicate, context) {
      predicate = cb(predicate, context);
      var keys = _.keys(obj),
          key;
      for (var i = 0, length = keys.length; i < length; i++) {
          key = keys[i];
          if (predicate(obj[key], key, obj)) return key;
      }
  };

  // Return a copy of the object only containing the whitelisted properties.
  _.pick = function(object, oiteratee, context) {
      var result = {},
          obj = object,
          iteratee, keys;
      if (obj == null) return result;
      if (_.isFunction(oiteratee)) {
          keys = _.allKeys(obj);
          iteratee = optimizeCb(oiteratee, context);
      } else {
          keys = flatten(arguments, false, false, 1);
          iteratee = function(value, key, obj) { return key in obj; };
          obj = Object(obj);
      }
      for (var i = 0, length = keys.length; i < length; i++) {
          var key = keys[i];
          var value = obj[key];
          if (iteratee(value, key, obj)) result[key] = value;
      }
      return result;
  };

  // Return a copy of the object without the blacklisted properties.
  _.omit = function(obj, iteratee, context) {
      if (_.isFunction(iteratee)) {
          iteratee = _.negate(iteratee);
      } else {
          var keys = _.map(flatten(arguments, false, false, 1), String);
          iteratee = function(value, key) {
              return !_.contains(keys, key);
          };
      }
      return _.pick(obj, iteratee, context);
  };

  // Fill in a given object with default properties.
  _.defaults = createAssigner(_.allKeys, true);

  // Creates an object that inherits from the given prototype object.
  // If additional properties are provided then they will be added to the
  // created object.
  _.create = function(prototype, props) {
      var result = baseCreate(prototype);
      if (props) _.extendOwn(result, props);
      return result;
  };

  // Create a (shallow-cloned) duplicate of an object.
  _.clone = function(obj) {
      if (!_.isObject(obj)) return obj;
      return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
  };

  // Invokes interceptor with the obj, and then returns obj.
  // The primary purpose of this method is to "tap into" a method chain, in
  // order to perform operations on intermediate results within the chain.
  _.tap = function(obj, interceptor) {
      interceptor(obj);
      return obj;
  };

  // Returns whether an object has a given set of `key:value` pairs.
  _.isMatch = function(object, attrs) {
      var keys = _.keys(attrs),
          length = keys.length;
      if (object == null) return !length;
      var obj = Object(object);
      for (var i = 0; i < length; i++) {
          var key = keys[i];
          if (attrs[key] !== obj[key] || !(key in obj)) return false;
      }
      return true;
  };


  // Internal recursive comparison function for `isEqual`.
  var eq = function(a, b, aStack, bStack) {
      // Identical objects are equal. `0 === -0`, but they aren't identical.
      // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
      if (a === b) return a !== 0 || 1 / a === 1 / b;
      // A strict comparison is necessary because `null == undefined`.
      if (a == null || b == null) return a === b;
      // Unwrap any wrapped objects.
      if (a instanceof _) a = a._wrapped;
      if (b instanceof _) b = b._wrapped;
      // Compare `[[Class]]` names.
      var className = toString.call(a);
      if (className !== toString.call(b)) return false;
      switch (className) {
          // Strings, numbers, regular expressions, dates, and booleans are compared by value.
          case '[object RegExp]':
              // RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')
          case '[object String]':
              // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
              // equivalent to `new String("5")`.
              return '' + a === '' + b;
          case '[object Number]':
              // `NaN`s are equivalent, but non-reflexive.
              // Object(NaN) is equivalent to NaN
              if (+a !== +a) return +b !== +b;
              // An `egal` comparison is performed for other numeric values.
              return +a === 0 ? 1 / +a === 1 / b : +a === +b;
          case '[object Date]':
          case '[object Boolean]':
              // Coerce dates and booleans to numeric primitive values. Dates are compared by their
              // millisecond representations. Note that invalid dates with millisecond representations
              // of `NaN` are not equivalent.
              return +a === +b;
      }

      var areArrays = className === '[object Array]';
      if (!areArrays) {
          if (typeof a != 'object' || typeof b != 'object') return false;

          // Objects with different constructors are not equivalent, but `Object`s or `Array`s
          // from different frames are.
          var aCtor = a.constructor,
              bCtor = b.constructor;
          if (aCtor !== bCtor && !(_.isFunction(aCtor) && aCtor instanceof aCtor &&
                  _.isFunction(bCtor) && bCtor instanceof bCtor) &&
              ('constructor' in a && 'constructor' in b)) {
              return false;
          }
      }
      // Assume equality for cyclic structures. The algorithm for detecting cyclic
      // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.

      // Initializing stack of traversed objects.
      // It's done here since we only need them for objects and arrays comparison.
      aStack = aStack || [];
      bStack = bStack || [];
      var length = aStack.length;
      while (length--) {
          // Linear search. Performance is inversely proportional to the number of
          // unique nested structures.
          if (aStack[length] === a) return bStack[length] === b;
      }

      // Add the first object to the stack of traversed objects.
      aStack.push(a);
      bStack.push(b);

      // Recursively compare objects and arrays.
      if (areArrays) {
          // Compare array lengths to determine if a deep comparison is necessary.
          length = a.length;
          if (length !== b.length) return false;
          // Deep compare the contents, ignoring non-numeric properties.
          while (length--) {
              if (!eq(a[length], b[length], aStack, bStack)) return false;
          }
      } else {
          // Deep compare objects.
          var keys = _.keys(a),
              key;
          length = keys.length;
          // Ensure that both objects contain the same number of properties before comparing deep equality.
          if (_.keys(b).length !== length) return false;
          while (length--) {
              // Deep compare each member
              key = keys[length];
              if (!(_.has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
          }
      }
      // Remove the first object from the stack of traversed objects.
      aStack.pop();
      bStack.pop();
      return true;
  };

  // Perform a deep comparison to check if two objects are equal.
  _.isEqual = function(a, b) {
      return eq(a, b);
  };

  // Is a given array, string, or object empty?
  // An "empty" object has no enumerable own-properties.
  _.isEmpty = function(obj) {
      if (obj == null) return true;
      if (isArrayLike(obj) && (_.isArray(obj) || _.isString(obj) || _.isArguments(obj))) return obj.length === 0;
      return _.keys(obj).length === 0;
  };

  // Is a given value a DOM element?
  _.isElement = function(obj) {
      return !!(obj && obj.nodeType === 1);
  };

  // Is a given value an array?
  // Delegates to ECMA5's native Array.isArray
  _.isArray = nativeIsArray || function(obj) {
      return toString.call(obj) === '[object Array]';
  };

  // Is a given variable an object?
  _.isObject = function(obj) {
      var type = typeof obj;
      return type === 'function' || type === 'object' && !!obj;
  };

  // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp, isError.
  _.each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Error'], function(name) {
      _['is' + name] = function(obj) {
          return toString.call(obj) === '[object ' + name + ']';
      };
  });

  // Define a fallback version of the method in browsers (ahem, IE < 9), where
  // there isn't any inspectable "Arguments" type.
  if (!_.isArguments(arguments)) {
      _.isArguments = function(obj) {
          return _.has(obj, 'callee');
      };
  }

  // Optimize `isFunction` if appropriate. Work around some typeof bugs in old v8,
  // IE 11 (#1621), and in Safari 8 (#1929).
  if (typeof /./ != 'function' && typeof Int8Array != 'object') {
      _.isFunction = function(obj) {
          return typeof obj == 'function' || false;
      };
  }

  // Is a given object a finite number?
  _.isFinite = function(obj) {
      return isFinite(obj) && !isNaN(parseFloat(obj));
  };

  // Is the given value `NaN`? (NaN is the only number which does not equal itself).
  _.isNaN = function(obj) {
      return _.isNumber(obj) && obj !== +obj;
  };

  // Is a given value a boolean?
  _.isBoolean = function(obj) {
      return obj === true || obj === false || toString.call(obj) === '[object Boolean]';
  };

  // Is a given value equal to null?
  _.isNull = function(obj) {
      return obj === null;
  };

  // Is a given variable undefined?
  _.isUndefined = function(obj) {
      return obj === void 0;
  };

  // Shortcut function for checking if an object has a given property directly
  // on itself (in other words, not on a prototype).
  _.has = function(obj, key) {
      return obj != null && hasOwnProperty.call(obj, key);
  };

  // Utility Functions
  // -----------------

  // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
  // previous owner. Returns a reference to the Underscore object.
  _.noConflict = function() {
      root._ = previousUnderscore;
      return this;
  };

  // Keep the identity function around for default iteratees.
  _.identity = function(value) {
      return value;
  };

  // Predicate-generating functions. Often useful outside of Underscore.
  _.constant = function(value) {
      return function() {
          return value;
      };
  };

  _.noop = function() {};

  _.property = property;

  // Generates a function for a given object that returns a given property.
  _.propertyOf = function(obj) {
      return obj == null ? function() {} : function(key) {
          return obj[key];
      };
  };

  // Returns a predicate for checking whether an object has a given set of
  // `key:value` pairs.
  _.matcher = _.matches = function(attrs) {
      attrs = _.extendOwn({}, attrs);
      return function(obj) {
          return _.isMatch(obj, attrs);
      };
  };

  // Run a function **n** times.
  _.times = function(n, iteratee, context) {
      var accum = Array(Math.max(0, n));
      iteratee = optimizeCb(iteratee, context, 1);
      for (var i = 0; i < n; i++) accum[i] = iteratee(i);
      return accum;
  };

  // Return a random integer between min and max (inclusive).
  _.random = function(min, max) {
      if (max == null) {
          max = min;
          min = 0;
      }
      return min + Math.floor(Math.random() * (max - min + 1));
  };

  // A (possibly faster) way to get the current timestamp as an integer.
  _.now = Date.now || function() {
      return new Date().getTime();
  };

  // List of HTML entities for escaping.
  var escapeMap = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#x27;',
      '`': '&#x60;'
  };
  var unescapeMap = _.invert(escapeMap);

  // Functions for escaping and unescaping strings to/from HTML interpolation.
  var createEscaper = function(map) {
      var escaper = function(match) {
          return map[match];
      };
      // Regexes for identifying a key that needs to be escaped
      var source = '(?:' + _.keys(map).join('|') + ')';
      var testRegexp = RegExp(source);
      var replaceRegexp = RegExp(source, 'g');
      return function(string) {
          string = string == null ? '' : '' + string;
          return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;
      };
  };
  _.escape = createEscaper(escapeMap);
  _.unescape = createEscaper(unescapeMap);

  // If the value of the named `property` is a function then invoke it with the
  // `object` as context; otherwise, return it.
  _.result = function(object, property, fallback) {
      var value = object == null ? void 0 : object[property];
      if (value === void 0) {
          value = fallback;
      }
      return _.isFunction(value) ? value.call(object) : value;
  };

  // Generate a unique integer id (unique within the entire client session).
  // Useful for temporary DOM ids.
  var idCounter = 0;
  _.uniqueId = function(prefix) {
      var id = ++idCounter + '';
      return prefix ? prefix + id : id;
  };

  // By default, Underscore uses ERB-style template delimiters, change the
  // following template settings to use alternative delimiters.
  _.templateSettings = {
      evaluate: /<%([\s\S]+?)%>/g,
      interpolate: /<%=([\s\S]+?)%>/g,
      escape: /<%-([\s\S]+?)%>/g
  };

  // When customizing `templateSettings`, if you don't want to define an
  // interpolation, evaluation or escaping regex, we need one that is
  // guaranteed not to match.
  var noMatch = /(.)^/;

  // Certain characters need to be escaped so that they can be put into a
  // string literal.
  var escapes = {
      "'": "'",
      '\\': '\\',
      '\r': 'r',
      '\n': 'n',
      '\u2028': 'u2028',
      '\u2029': 'u2029'
  };

  var escaper = /\\|'|\r|\n|\u2028|\u2029/g;

  var escapeChar = function(match) {
      return '\\' + escapes[match];
  };

  // JavaScript micro-templating, similar to John Resig's implementation.
  // Underscore templating handles arbitrary delimiters, preserves whitespace,
  // and correctly escapes quotes within interpolated code.
  // NB: `oldSettings` only exists for backwards compatibility.
  _.template = function(text, settings, oldSettings) {
      if (!settings && oldSettings) settings = oldSettings;
      settings = _.defaults({}, settings, _.templateSettings);

      // Combine delimiters into one regular expression via alternation.
      var matcher = RegExp([
          (settings.escape || noMatch).source,
          (settings.interpolate || noMatch).source,
          (settings.evaluate || noMatch).source
      ].join('|') + '|$', 'g');

      // Compile the template source, escaping string literals appropriately.
      var index = 0;
      var source = "__p+='";
      text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
          source += text.slice(index, offset).replace(escaper, escapeChar);
          index = offset + match.length;

          if (escape) {
              source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
          } else if (interpolate) {
              source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
          } else if (evaluate) {
              source += "';\n" + evaluate + "\n__p+='";
          }

          // Adobe VMs need the match returned to produce the correct offest.
          return match;
      });
      source += "';\n";

      // If a variable is not specified, place data values in local scope.
      if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

      source = "var __t,__p='',__j=Array.prototype.join," +
          "print=function(){__p+=__j.call(arguments,'');};\n" +
          source + 'return __p;\n';

      try {
          var render = new Function(settings.variable || 'obj', '_', source);
      } catch (e) {
          e.source = source;
          throw e;
      }

      var template = function(data) {
          return render.call(this, data, _);
      };

      // Provide the compiled source as a convenience for precompilation.
      var argument = settings.variable || 'obj';
      template.source = 'function(' + argument + '){\n' + source + '}';

      return template;
  };

  // Add a "chain" function. Start chaining a wrapped Underscore object.
  _.chain = function(obj) {
      var instance = _(obj);
      instance._chain = true;
      return instance;
  };

  // OOP
  // ---------------
  // If Underscore is called as a function, it returns a wrapped object that
  // can be used OO-style. This wrapper holds altered versions of all the
  // underscore functions. Wrapped objects may be chained.

  // Helper function to continue chaining intermediate results.
  var result = function(instance, obj) {
      return instance._chain ? _(obj).chain() : obj;
  };

  // Add your own custom functions to the Underscore object.
  _.mixin = function(obj) {
      _.each(_.functions(obj), function(name) {
          var func = _[name] = obj[name];
          _.prototype[name] = function() {
              var args = [this._wrapped];
              push.apply(args, arguments);
              return result(this, func.apply(_, args));
          };
      });
  };

  // Add all of the Underscore functions to the wrapper object.
  _.mixin(_);

  // Add all mutator Array functions to the wrapper.
  _.each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
      var method = ArrayProto[name];
      _.prototype[name] = function() {
          var obj = this._wrapped;
          method.apply(obj, arguments);
          if ((name === 'shift' || name === 'splice') && obj.length === 0) delete obj[0];
          return result(this, obj);
      };
  });

  // Add all accessor Array functions to the wrapper.
  _.each(['concat', 'join', 'slice'], function(name) {
      var method = ArrayProto[name];
      _.prototype[name] = function() {
          return result(this, method.apply(this._wrapped, arguments));
      };
  });

  // Extracts the result from a wrapped and chained object.
  _.prototype.value = function() {
      return this._wrapped;
  };

  // Provide unwrapping proxy for some methods used in engine operations
  // such as arithmetic and JSON stringification.
  _.prototype.valueOf = _.prototype.toJSON = _.prototype.value;

  _.prototype.toString = function() {
      return '' + this._wrapped;
  };

  // AMD registration happens at the end for compatibility with AMD loaders
  // that may not enforce next-turn semantics on modules. Even though general
  // practice for AMD registration is to be anonymous, underscore registers
  // as a named module because, like jQuery, it is a base library that is
  // popular enough to be bundled in a third party lib, but not be part of
  // an AMD load request. Those cases could generate an error when an
  // anonymous define() is called outside of a loader request.
  if (typeof define === 'function' && define.amd) {
      define('underscore', [], function() {
          return _;
      });
  }
}.call(this));